Panasonic S-45PU1E5 Technical Data & Service Manual page 384

1
2-1 Installation Instructions
To the outdoor unit or
next branch pipe
If the size of the selected refrigerant pipe and the size of the branch
pipe differ, cut the connecting section with pipe cutters per the
illustration at right.
(Be sure to deburr and remove any impurities on the cutting surface.)
2-2 Installation precaution
Position the branch pipe on the appropriate horizontal and vertical plane so that branch flow is even.
Horizontal
line
2-3 Precautions at connecting points
After removing any impurities at the mouth of the pipe or the connecting points, be sure to clean the
inside of the pipe with nitrogen gas (nitrogen displacement) to prevent oxide scale forming on the
inner surface of the pipe. This step is extremely important when making the connections in the
refrigerant piping. (Do not use an antioxidant)
3. Insulation directions
Gas side / Liquid side branch pipe insulation.
Note: Use insulating material that can tolerate 120°C on the gas side.
1) Insulate the gas side / liquid side of the
branch pipe with thermal insulator.
Thermal insulator
3) Wrap a wide PVC tape all around the surfaces
where the ends of the branch pipe and insulating
materials are abutted so as to close any gaps.
Refrigerant pipe
Input
Horizontal line
Gas side / Liquid side of
the branch pipe
Wide PVC tape (Field supply)
Output (1) To next branch pipe
or indoor unit
Output (2)
Refrigerant pipe
Gas side / Liquid side
branch pipe
Within 30°
15°
(Within a 30° incline)
2) Wrap tape all around the areas where the insulating
materials are joined in order to seal it.
Tape (Field supply)
Thermal insulator
(Accessory)
Insulating material for
refrigerant piping
Note: Do not use any adhesive agents on the
connections between thermal insulator.
1-374
Installation on a
vertical plane is also
possible